[PATCH RFC 13/77] bna: Update MSI/MSI-X interrupts enablement code

Alexander Gordeev
2013-10-02T10:48:29Z

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
drivers/net/ethernet/brocade/bna/bnad.c | 34 ++++++++++++------------------
1 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index b78e69e..d41257c 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -2469,21 +2469,11 @@ bnad_enable_msix(struct bnad *bnad)
if (bnad->msix_table)
return;

- bnad->msix_table =
- kcalloc(bnad->msix_num, sizeof(struct msix_entry), GFP_KERNEL);
-
- if (!bnad->msix_table)
+ ret = pci_msix_table_size(bnad->pcidev);
+ if (ret < 0)
goto intx_mode;

- for (i = 0; i < bnad->msix_num; i++)
- bnad->msix_table[i].entry = i;
-
- ret = pci_enable_msix(bnad->pcidev, bnad->msix_table, bnad->msix_num);
- if (ret > 0) {
- /* Not enough MSI-X vectors. */
- pr_warn("BNA: %d MSI-X vectors allocated < %d requested\n",
- ret, bnad->msix_num);
-
+ if (ret < bnad->msix_num) {
spin_lock_irqsave(&bnad->bna_lock, flags);
/* ret = #of vectors that we got */
bnad_q_num_adjust(bnad, (ret - BNAD_MAILBOX_MSIX_VECTORS) / 2,
@@ -2495,15 +2485,19 @@ bnad_enable_msix(struct bnad *bnad)

if (bnad->msix_num > ret)
goto intx_mode;
+ }

- /* Try once more with adjusted numbers */
- /* If this fails, fall back to INTx */
- ret = pci_enable_msix(bnad->pcidev, bnad->msix_table,
- bnad->msix_num);
- if (ret)
- goto intx_mode;
+ bnad->msix_table =
+ kcalloc(bnad->msix_num, sizeof(struct msix_entry), GFP_KERNEL);
+
+ if (!bnad->msix_table)
+ goto intx_mode;

- } else if (ret < 0)
+ for (i = 0; i < bnad->msix_num; i++)
+ bnad->msix_table[i].entry = i;
+
+ ret = pci_enable_msix(bnad->pcidev, bnad->msix_table, bnad->msix_num);
+ if (ret)
goto intx_mode;

pci_intx(bnad->pcidev, 0);
--
1.7.7.6